125642216025 has 18 divisors (see below), whose sum is σ = 225039169550. Its totient is φ = 67009181760.

The previous prime is 125642215987. The next prime is 125642216027. The reversal of 125642216025 is 520612246521.

125642216025 is a `hidden beast` number, since 1 + 2 + 5 + 6 + 42 + 2 + 1 + 602 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 23141711376 + 102500504649 = 152124^2 + 320157^2 .

It is not a de Polignac number, because 125642216025 - 2⁶ = 125642215961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125642216027) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 279204700 + ... + 279205149.

Almost surely, 2^125642216025 is an apocalyptic number.

125642216025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

125642216025 is a deficient number, since it is larger than the sum of its proper divisors (99396953525).

125642216025 is a wasteful number, since it uses less digits than its factorization.

125642216025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558409865 (or 558409857 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 125642216025 in words is "one hundred twenty-five billion, six hundred forty-two million, two hundred sixteen thousand, twenty-five".